The well being of your small Mediterranean country is partially dependent on Rome's stability. Your neighbors only two neighbors, the Sarmatians and the Siraces, are nomadic hordes, and they aren't exactly going to be the friendliest of neighbors (towards you and each other).

As the game goes on, its very likely that the Romans will begin to crumble. You don't have to end up the way they did. In order for that to happen, declare a war for independence when their empire grows incredibly weak. Just be careful when you try to do this, because the northern hordes are going to be preying on the weak and each other (once again, if hordes neighbor each other, they will to the death).

Try to see if the Alans, Iberia, Armenia, or Dacia are willing to become allies. They will be helpful in expanding north and eastwards into the hordes. Bosporus has Roman tech, that means you will be ahead of the barbarians and steppe nomads in technology. Use this to your advantage and attack your enemies when they are weak.